Testing device for gas-engines.



' W. 0. FORGE. TESTING DEVICE FOR GAS ENGINES.

APPLICATION FILED APR. 28, 1913.

V Patented May 5, 1914.

6 W 1 W 1 M Z Y 2 w Z1", m n a W n V v M, 5 5 1 $51 atto'mau I WILLIAMCUTTER FORCE, OF NORTH PLAINFIELD, NEW JERSEY.

TESTING DEVICE FOR GAS-ENGINES.

Specification of Letters Patent.

Patented May 5, 1914.

Application filed April 28, 1913. Serial No. 763,993.

To all whom it may concern:

Be it known that I, WILLIAM C. Fonon, a citizen of the United States,anda resident of North Plainfield, in the county of Somerset and Stateof New Jersey, have invented certain new and useful Improvements inTesting Devices for Gas-Engines, of which the following is aspecification.

The present invention relates generally to a testing device for aninternal combustion motor, and has for its object the production of adevice for coi'iveniently and quickly testing the ignition system of themotor, and locating misfiring in cylinders.

The invention consists of the features expressed in the claims, avpreferred embodiment of which is shown in the accompanying drawings anddescription.

In the said'drawings: Figure 1 is a diagrammatic view showing thetesting device applied to an internal combustion motor. Fig. 2 is anenlarged detail view of the testing device, with parts broken away andin section to more clearly illustrate the interior construction of thedevice. Fig. 3 is a detail sectional view on the line 33 of Fig-2, withsome of the parts shown in elevation.

Like reference characters indicate correspending parts throughout theseveral views. o indicates a currentconducting member adapted to begrounded on the motor. As

here shown it consists of a hollow weight electrically and mechanicallyconnected to a flexible current conducting member 6, the free end ofwhich is adapted to be placed in circuit with the spark plug of aninternal combustion motor. In the preferred form I provide a pluralityof flexible current conducting members (5, which may conveniently bemade in one piece and bent into a loop as at 7, and a portion of theinsulation removed and the loop inserted in the hollow. portion of theweighted member .3. A body of current conducting material 8, such aslead or Babbitt metal, surrounds the looped end of the flexible currentcomlucting member and forms an electrical coimcctiou between the latterandthe weight. A body of fiber 9 may als be inserted in the opening inthe said weight. to prevent the insulation sur rounding the flexiblecurrent conducting members from being cut or injured. Preferably thesaid flexible current conducting members (3 are mcclmnically andelectrically connected, as slrown, to the contacts 10, in this case bypassing up through an opening 11 in the side of the said contact memberand having the insulation removed so that the naked wire 12 will extendinto the tipsl3 of the said contact members. The contact members areformed with a hollow space 14 adjacent to the said tips, into which theinsulated part of the current conducting members may extend, andinsulated handles 15 are preferably utilized for carrying the contactmembers.

In Fig. l the method of using the device is shown and for this purposethere are disclosed the electrical circuits generally utilized inconnection with the sparking device of the ignition system of aninternal combustion motor. Ordinarily the path of the secondary orignition current is from the contacts 16 of the distributer, throughsecondary wires '17, each going to one of the spark plugs '18, 19, 20and 21. Thence the circuit is across the spark plug gap in a wellknownmanner, through cylinders and ground wire, indicated in dotted lines22,to

the rotor 3 of the magneto.

In using the testing device of the present invention the weighted member5 is placed on the motor frame, as shown, and thus a ground connectionis made from the same to the rotor of the magneto. Then by placing thecontact member 10 on one of the spark plugs the current will be shuntedfrom the secondary wire 17 to the said contact member 10, thence throughtie flexible current conducting member 6 ant to the weighted currentconducting member 5. Thus the current is prevented from passing throughthe spark plug inside the cylinder.

In the diagram shown in Fig. 1 both of the contactslO are utilized, onebeing placed on thespark plug of the first cylinder and the other on thespark plug of the third cylinder.- Assuming the motor to be running,then if the second and the fourth cylinders .are firing' regularly, itis obvious that the misfiring, due to faulty compression or othercauses, is in either the first or thethird cylinder. By changing thecontact member 10 of the testing device from thle third cylinder to thefourth cylinder, it will be ascertained whether or not it is the first'or the third cylindcr which is misfiring, because if the second and thethird cylinders fire regularly, it is clear tha tsit 'must be the firstcylinder which is misliri ng'. This is one method out of several wherebythis device can'be utilized, since of course the cylinders may be testedin any combination desired.

in addition, by placing the weighted mom-- her on the frame of the motorand by holding one of the terminals about oneeighth of an inch from thetop of the spark plug, a spark can be produced between the top of thespark plug and the contact member 10. In this way it can be determinedmay be employed.

whether or not current is passing properly from the distributer of themagneto. If the spark device is of the make and break type, the contactmember 10 can be placed in contact with one of the spark plugs and thenmoved slowly out of contact therewith, whereby a spark will likewise beproduced.

At the end of one of the contacts 15 I ma y pivot two gages, one, 24-,for gaging the proper distance between the two points of the spark pluginside the cylinder, when using the magneto, and the other, 25, forgaging the proper distance between the same points when using thebattery. The end of.

the other handle 15 may be provided with a fork 26 by means of which thespark plug points can be readily bent or adjusted. If desired, more thantwo contact members 10 hat is claimed, is:

l. A testing device for internal combustion motors comprising, a currentconduct-- ing member adapted to be grounded on the motor, a plurality ofhandles each having a contact member adapted to be placed in circuitwith a spark plug, and flexible current conducting members connected tothe firstmentioned current conducting member and to the respectivehandles.

2. A testing device for internal combustion motors comprising, aplurality of handles each having a contact member adapted to be placedin circuit with the spark plug, a flexible currentconducting memberconnected to each contact member, and a common current conducting memberconnected to the flexible current conducting members and adapted to begrounded on the motor.

8. A testing device for internal combustion motors comprising, a currentconduct ing member adapted to be grounded on the motor, and a flexiblecurrent conducting member formed into a loop and. having its said loopelectrically and mechanically connccted to the current conducting'membcr,

the free ends of said flexible current conducting member being adaptedto be placed in circuit with the spark plu i. A testing device forinternal combus tion motors comprising, a current conductiug memberadapted to begrounded on the motor, a flexible current conducting memberformed into a loop and having its said loop electrically andmechanically connected to the current conducting member, and handleshaving contact'members adapted to be placed in circuit with the sparkplugs electrically and mechanically connected to the free ends of theflexible current conducting member.

5. A testing device for internal combustion motorscomprising, a weightedcurrent conducting member adapted to be grounded on the motor, aplurality of handles each having a contact member adapted to be placedin circuit with the spark plug, and flexible current conducting membersconnected to the weighted current conducting member and to therespective handles.

6. A testing device for internal combustion motors comprising, twohandles each having a contact member adapted to be placed in circuitwith the spark plug, a flexible current conducting member connected toeach contact member, and a weighted common current conducting memberconnected to the flexible current conducting members and adapted to begrounded on the motor.

7. A testing device for internal combustion motors comprising, aweighted current conducting mcmbe adapted to be groumlcd on the motor,and a flexible current condu t-- ing member formed into aloop andhaving, its said loop electrically and mechanically connected to theweighted current conducting member, the free ends of said flexiblecurrent conducting member being adapted to be placed,in circuit with thespark plug.

8. A testing device for internal combustion motors comprising, aweighted current conducting member adapted to be grounded on the motor,a flexible current conductiin, member formed into a loop and having itssaid loop electrically and mechanically connected to the weightedcurrent conducting member, and handles having contact members adapted.to be placed in circuit with the spark plugs electrically andmechanically connected to the free ends of the flexible currentconducting member.

9. A testing device for internal combuslion motors comprising, aflexible current conducting member adapted to be grounded on the motor,a contact member having an opening in its side through which saidflexible current conducting member may extend, and means forelectrically and mechanically connecting the flexible current conductingmember and the contact member.

Signed at Plainfield in the county of Union and State of New Jersey this21 day of April. A. D. 1913.

WILLIAM CUTTER FORCE.

Witnesses:

F. J. Bm'rz, 'lmucsa V. L nch;

